How to Grow Pearl Lupins Canada

By the SoilCommander Editorial Team, under the guidance of Nitin Sharma, Co-Founder · · How we check our facts

On this page
  1. Pearl Lupin (Lupinus mutabilis)
  2. At a Glance
  3. Quick Facts
  4. Soil & Growing Conditions
  5. Growth Stages
  6. Harvest & Storage
  7. Pests
  8. Plan your Pearl Lupins planting
  9. Growing Pearl Lupin in another region
  10. Sources
  11. Frequently Asked Questions

Pearl lupins (Lupinus mutabilis).

Core growing advice on this page is checked against named horticultural sources — see References.

Pearl Lupin (Lupinus mutabilis)

A pearl lupin plant with pink flower spikes — “Planta de tarwi” by Morales Cynthia is licensed under CC BY-SA 4.0.

3 sources cited · Verified

At a Glance

Close-up of a white, pink and yellow pearl lupin flower — “Lupinus mutabilis en el humedal El Burro” by Juan Carlos Sáenz Rodríguez is licensed under CC BY-SA 4.0.
“Lupinus mutabilis en el humedal El Burro” by Juan Carlos Sáenz Rodríguez is licensed under CC BY-SA 4.0.
Lupinus mutabilis Pearl Lupin Lupin aphid Slugs PESTS

Quick Facts

A pearl lupin plant with pink flower spikes — “Planta de tarwi” by Morales Cynthia is licensed under CC BY-SA 4.0.
“Planta de tarwi” by Morales Cynthia is licensed under CC BY-SA 4.0.
Factor Value
Soil pH 5 - 6.5
Optimal growing temp 18-24°C
Soil texture Loam, sand (RHS); succeeds in any moderately good soil (Useful Tropical Plants)
Drainage Moist but well-drained (RHS); well-drained soils preferred, though it succeeds on poor soils via its deep taproot (Useful Tropical Plants)
Edible parts seeds

Soil & Growing Conditions

A field of flowering pearl lupin plants — “Lupinus mutabilis Cotacachi” by Awkiku is licensed under CC BY-SA 3.0.
“Lupinus mutabilis Cotacachi” by Awkiku is licensed under CC BY-SA 3.0.

Water: Prefers 500-1000mm annual rainfall, tolerates a range of 350-1700mm (Useful Tropical Plants)

Soil pH range

5 6.5

Span reflects genuine variation between the cited authorities, not a single agreed figure.

Growth Stages

A pearl lupin palmate leaf with dew drops — “Hojas de tarwi” by AsiriMH is licensed under CC BY-SA 4.0.
“Hojas de tarwi” by AsiriMH is licensed under CC BY-SA 4.0.
Stage BBCH Notes
Sowing and establishment 0 Pre-soak seed 24 hours in warm water before sowing in situ; protect from mice. Germination takes place within about 2 weeks (Useful Tropical Plants). RHS grows the crop from seed, propagated indoors or outdoors.
Vegetative growth 3 Erect, bushy growth to 0.5-1m in UK cultivation (RHS), though up to 2.5m recorded in its native range (Useful Tropical Plants); blue-green leaves of 7-9 leaflets. The deep taproot breaks up poor subsoil, and as a nitrogen-fixing legume the crop can fix up to 400kg N/hectare (Useful Tropical Plants).
Flowering 6 Upright spires of small, pea-like flowers on blue-green foliage (RHS). Flowering and pod-set continue until frost kills the plant (Useful Tropical Plants).
Fruiting and harvest 8 Takes 5-11 months in total to fully ripen its seed crop; the continuous flowering habit makes mechanical harvesting difficult (Useful Tropical Plants). Recorded seed yields range from 290kg up to 7 tonnes per hectare depending on region and variety.

Harvest & Storage

Harvested pearl lupin (tarwi) seeds at a market — “Mercado Punata - Cochabamba Bolivia - Mercado Central de Punata 22 - Tarwi - chuchusmuti” by Mauri777AE is licensed under CC BY-SA 4.0.
“Mercado Punata - Cochabamba Bolivia - Mercado Central de Punata 22 - Tarwi - chuchusmuti” by Mauri777AE is licensed under CC BY-SA 4.0.

When to pick: Continuous flowering and pod-set until frost kills the plant makes mechanical harvesting difficult; the crop takes 5-11 months in total to fully ripen (Useful Tropical Plants). Seed yields recorded from 290kg up to 7 tonnes per hectare depending on region and variety, with an oil content up to 18%.

Storage

Raw seed is toxic and must be processed before eating: soak overnight, or 2-3 days with water changes, to leach out bitter quinolizidine alkaloids; some low-alkaloid "sweet" forms bred for lower toxicity need less processing (Useful Tropical Plants). RHS confirms the plant is harmful if eaten unprepared, including to pets.

Pests

A blue, white and yellow pearl lupin flower spike — “Flor de Tarwi” by Cggtcggt is licensed under CC BY-SA 4.0.
“Flor de Tarwi” by Cggtcggt is licensed under CC BY-SA 4.0.
Lupin aphid
moderate

Macrosiphum albifrons

Named directly by RHS as one of the main pests of lupins; RHS's dedicated advice page states severely impacted plants typically wilt.

Slugs
low

Gastropoda (slugs, various spp.)

Named directly on RHS's own growing-guide page as one of two pests this crop is susceptible to (no severity grading given).

Plan your Pearl Lupins planting

When to sow and plant Pearl Lupins depends on your own frost dates. Check the Canada vegetable planting calendar. To work out where it fits in your beds, sketch your plot in the free Garden Layout Planner.

Growing Pearl Lupin in another region

Sowing dates, frost timing and local advice differ by country. Use the guide for where you garden.

Sources

The full list of 3 sources behind this guide (Royal Horticultural Society, Useful Temperate Plants, Useful Tropical Plants Database (Ken Fern)) is in the references of our UK guide to pearl lupins; they describe the plant itself, which is the same wherever it grows.

Frequently Asked Questions

What soil pH do pearl lupins need?

A pH of about 5–6.5. That span reflects genuine variation between the authorities we cite rather than a single agreed figure — the References section lists each source's exact range.

Plan next season before the problems start

Short-season growing is arithmetic before it is technique: days to maturity against frost-free days decides what will finish at all. The Canada Garden Planner does that subtraction for your region before you sow.

Get the Canada Garden Planner →

Instant PDF download · Written for Canadian growing conditions

SoilCommander Editorial Team — under the guidance of Nitin Sharma, Co-Founder

Every growing guide is checked against RHS, USDA Cooperative Extension, and other named horticultural authorities before publishing. How we check our facts.

How this guide is put together

The growing data on this page — sowing windows, pests, diseases, soil and site requirements — comes from named horticultural sources, listed in References below, checked against Canadian hardiness-zone and frost-date data, with provincial agriculture and university extension sources cited directly where one exists for a crop. An automated pipeline assembles that verified data into the page you're reading: it selects which facts to lead with and builds the surrounding prose and layout. It does not invent a date, a source or a number — where a verified value for a field isn't available, the page leaves it out rather than guessing. A person reviews and publishes each page; nothing goes live unverified.

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Last verified 2026-09-03

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